Steam-boiler indicator



(No Model.)

' G. L. MG'DBRMOTT. STEAM BOILER INDICATOR.

No. 487,634. Patented Dec. 6, 1892.

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. named connection is constructed with a screw- UNi-TED STATES PATENTCEETCE.

GEORGE LAWRENCE MCDERMOTT, OF NEENAH, WISCONSIN.

STEAM-BOILER INDICATOR.

SPECIFICATION forming part of Letters Patent No. 487,684, dated December6, 1892. Application filed July 26, 1892. Serial No. 441,2552. (Nomodel.)

To @ZZ whom t may concern.-

Be it known that I, GEORGE LAWRENCE MODERMOTT, of Neenah, in the countyof Winnebago and State of Wisconsin, have invented certain new anduseful Improvements in Steam-Boiler Indicators; and I do hereby declarethe following to be a full, clear, and eX- act description of theinvention, such as will enable others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

Myinvention relates to an improvement-in steam-boiler indicators; and itconsists in the novel features of construction which will be fullydescribed hereinafter, and more especially referred to in the claims.

The object of my invention is to construct an improved electricalindicator or alarm which may be readily attached to the Water gage of anordinary boiler without in any Wise tampering with the boiler proper,thus eliminating all danger of accident while applying the improveddevice.

A further object of my invention is to so construct the contact-plateson the verticallymoving rods that they will adjust themselves to bothcontact-points even though the rod itself is not in a perfectly-verticalposition.

In the accompanying drawings, Figure 1 is a vertical sectional view of asteam-boiler Water-tube, showing my improved indicator attached thereto,a portion of the latter also being in section. Fig. 2 is an enlargeddetached view of the vertically-movable float, contact-plates, andconnecting-rod.

A represents the water-tube of ordinary construction, B the connectionbetween its lower end and the boiler, and C the valved connectionbetween its top end and the boiler. The upper side of the outer end ofthis lastthreaded depression, which communicates with the glass A by thevertical passage G. Adapted to be inserted in this socket is thevertically-recessed head D, having an enlarged interiorly screw-threadedopening E at its upper end. The upper end of the passage G ares outward,as shown, where it communicates with the opening E. Extending diagonallyupward through these flared sides are the contact-points F.

G represents a cylinder which is adapted 'to screw into the opening E,and secured to the upper end of this cylinder is the cap G, thus forminga tight closure of the cylinder. Depending through this cap are thecontactpoints H and connected thereto are the respective ends of thecircuit-wire I. The wire ends at these points are also connected withthe depending wires J, which are secured at their lower ends to thecontact-points F.

A float K is adapted to move in the glass A, its position therein beingregulated by the height of the Water in said glass. Extending upwardfrom this fioat is the rod L, which projects into the cylinder G. 'llothe upper end of this rod is secured the disk of non-conducting materialM, and immediately above and below this disk are secured thecontact-plates N. The latter are fastened to the rod L in such a mannerthat they are allowed a slight Wabbling movement, so that when the floatrises to the top of the glass A the said upper contact-plate will bemoved vertically against the lower ends of the upper contact-points H,thus closing the circuit in the wire I and sounding a bell-alarm at anydesired point within hearing of the engineer. The plate being allowedthis wabbling movement, an upward pressure is sure to bringit in contactwith both points H whether the rod L is vertical within the cylinder ornot. In like manner when the water in the boiler becomes very 10W thefloat descending draws the lower plate N in contact with the points F',which also closes the circuit and sounds the alarm.

The cap G and the head D are hexagon in form, so that a wrench may beconveniently applied thereto forturning the same. Rubber packing isplaced within the said head and cap, against which the ends of thecylinder bear, thus making a very tight joint, which effect-uallyprevents leakage.

The indicator mechanism above described is entirely removed from theboiler proper and may be readily attached to water-gages of oro dinaryconstruction without in any wise tamper-in g with the boiler. Thus amost effectual I claim as new, and desire to secure by Letters Patent,is-

1. The combination of a steam-boiler Water tube, a cylinder supportedabove and in com- 5 munication with said tube, contact-points at theupper and lower ends of the cylinder, a float in the tube, a rodprojecting therefrom into the cylinder, and contact-plates looselysecured to the upper end of the rod, substanro tially as shown anddescribed.

2. The combination of a water-tube of a stea1n-boiler, a cylindersupported above and inI communication with said tube, contact-

